Posted Date
Effective Date
Update Type Test Methodology Changed
CPT Code 80299
Order Code MMLR
Referral Laboratory Mayo Medical Laboratories

Trimethoprim / Sulfamethoxazole

Order Code:                             MMLR

CPT Code:                               80299

Referral Laboratory:                Mayo Medical Laboratories


Effective May 27, 2020. MLabs will be changing the testing methodology for Trimethoprim / Sulfamethoxazole (MMLR) per Mayo Medical Laboratories.


Current Method


New Method

High-Performance Liquid Chromatography (HPLC)


Liquid Chromatography Tandem Mass Spectrometry (LC-MS/MS)